/**
 * Emit POSIX-shell lines that WARN (to stderr, never abort) when a
 * `preLaunchEnv` name resolves to an empty string after `preLaunch` runs.
 * Length-0 is the reliable tell for the `export VAR="$(cat missing-file)"`
 * failure mode: `export` masks the substitution's non-zero exit status, so
 * `set -e` and exit-code checks do not catch it.
 *
 * Warn-only is deliberate — a hard-abort mode is a separate opt-in, so the
 * chain (prompt read, prompt-dir cleanup, exec) must not be short-circuited
 * by an empty value here.
 *
 * Returns `[]` for an empty input list so callers can splat unconditionally
 * into their `&&` chain.
 *
 * The safehouse and unwrapped-host chains both unset each `preLaunchEnv` name
 * before running `preLaunch`, so the check reflects what `preLaunch` produced
 * instead of a value inherited from the parent shell.
 *
 * Names must be POSIX identifiers (`[A-Za-z_][A-Za-z0-9_]*`); groundcrew's
 * `validatePreLaunchEnv` in `src/lib/config.ts` enforces that, so no shell
 * escaping is done here.
 */
export declare function buildPreLaunchEmptyCheckLines(names: readonly string[]): string[];
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